package gov.kqqzyyy.monkey.radiologyscreen.mytools;

import android.content.Context;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;

class CrashHandler implements Thread.UncaughtExceptionHandler {

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;

    private static CrashHandler instance;

    // 用来存储设备信息和异常信息
    private Map<String, String> infos;

    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    static CrashHandler getInstance() {
        if (instance == null) {
            instance = new CrashHandler();
        }
        return instance;
    }

    /**
     * 初始化
     */
    void init(Context context) {
        MyApplication myApplication = (MyApplication) context;
        infos = myApplication.getDeviceInfos();
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            thread.interrupt();
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex throw错误
     * @return true:如果处理了该异常信息; 否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null)
            return false;
        try {
            Writer result = new StringWriter();
            PrintWriter printWriter = new PrintWriter(result);
            ex.printStackTrace(printWriter);
            System.out.println(result.toString());
            ex.printStackTrace();


            saveCrashInfoFile(ex);            // 保存日志文件
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex throw错误
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfoFile(Throwable ex) throws Exception {
        StringBuilder sb = new StringBuilder();
        try {
            SimpleDateFormat sDateFormat = new SimpleDateFormat(
                    "yyyy/MM/dd HH:mm:ss", Locale.CHINA);
            String date = sDateFormat.format(new Date());
            sb.append("\r\n").append(date).append("\n");
            for (Map.Entry<String, String> entry : infos.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                sb.append(key).append("=").append(value).append("\n");
            }
            Writer writer = new StringWriter();
            PrintWriter printWriter = new PrintWriter(writer);
            ex.printStackTrace(printWriter);
            Throwable cause = ex.getCause();
            while (cause != null) {
                cause.printStackTrace(printWriter);
                cause = cause.getCause();
            }
            printWriter.flush();
            printWriter.close();
            String result = writer.toString();
            sb.append(result);
            return writeFile(sb.toString());
        } catch (Exception e) {
            Log.e("APE", "an error occured while writing file...", e);
            sb.append("an error occured while writing file...\r\n");
            writeFile(sb.toString());
        }
        return null;
    }

    private String writeFile(String sb) throws Exception {
        String time = formatter.format(new Date());
        String fileName = "yfp-" + time + ".log";
        if (FileUtil.hasSdcard()) {
            String path = getGlobalpath();
            File dir = new File(path);
            if (!dir.exists())
                if (dir.mkdirs()) {
                    Log.e("APE", "make dir success!");
                }
            FileOutputStream fos = new FileOutputStream(path + fileName, true);
            fos.write(sb.getBytes());
            fos.flush();
            fos.close();
        }
        return fileName;
    }

    private static String getGlobalpath() {
        return Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator + "crash" + File.separator;
    }

}
